I never heard of him but I did do a search on the internet on his name. What I read, it doesn't sound good. Most of the post regarding it said it's a rip off.
I hope Admin doesn't mind me posting link to other post. If not, please feel free to delete this post.
http://www.oes.org/page2/3577~Dean_Rankin's_How_to_make_your_dog_obey_in_15 _min_a_d.html
http://www.pets.com.sg/forums/showth...011#post170011